Pavement



W, E. HASSAM.

PAVEMENI.

Ai'lLiCMiUN mw manna-1;

Patented, Jan. 18, 1921.

2 SHEETSSHEET I.

W. E HASSAM.

PAVEMENT.

APPLICATION FILED 8.111919.

1,365,687; Patented Jan. 18,1921.

2 SHEETS-SHEET 2.

1 xi wf nenfiov UNITED STATES PATENT OFFICE.

WALTER E. HASSAM, OF WORCESTER, MASSACHUSETTS, ASSIGNOB TO WELIAI NILESSTARK. OF WORCESTER, MASSACHUSETTS.

PAVEMENT.

Application filed February 17, 1919.

To all whom it may concern:

Be it known that I, WALTER E. HASSAM, a citizen of the United States,residmg at Worcester, in the county of Worcester and Commonwealth ofMassachusetts, have 1nvented a new and useful Improvement in Pavements,of which the following is a specification, accompanied by drawingsforming a part of the same.

The objects of my present invent on are, to reduce the cost of apavement having a concrete foundation; to provide an improved wearingsurface for pavements of this character; and to provide monolithicsectlons separable from the rest of the pavement, which are capable ofbem removed and replaced when necessary or repairing the roadbed,relaying the track of an electric railway, or for making excavations forwater and sewer pipes, and these objects are secured by the peculiarconstruction of the pavement as hereinafter described, the features ofnovelty being pointed out in the annexed claims.

Referring to the accompanying drawings,

Figure 1 represents a plan view of a section of a paved roadwayembodying my present improvement.

Fig. 2 is a transverse sectional view of pavement represented in Fig. 1.

Fig. 3 represents in side elevation the blocks forming the wearingsurface of the pavement and illustrating their method of attachment tothe concrete foundation.

Fig. 4 represents the under side of one of the surface blocks, with thereinforcing wires embedded therein represented by roken lines.

Fig. 5 is a detached perspective view of the reinforcing wires containedin each of the surface blocks.

Fig. 6 represents a perspective view of a portion of my improved paving,with one of the detachable monolithic sections raised from its positionon the roadbed.

Fig. 7 is a similar view to that shown in Fig. 3, but having amodification in the construction of the base.

Similar reference characters refer to similar parts in the differentfigures.

Specification of Letters Patent.

Patented Jan. 18, 1921.

Serial No. 277,593.

Referring to the accompanying drawings, 1, 1, denotes curbing on theopposite sides of a roadway between which my improved pavement isplaced, as shown in sectional view in Fig. 2. In the center of theroadway as shown in Figs. 1 and 2, I have represented the rails 2, 2, ofan electric railway, said rails resting upon a series of cross ties 3,Fig. 2. In carrying my invention into effect after the roadbed has beensuitably crowned, I place a layer 4, consisting of a composition in awet state, of any materials suited for the purpose which are usuallyemployed in forming the foundation of a. paved roadway.

In the present instance I form the composition preferably of one part ofhydraulic cement, two parts of sand,and four parts of broken stone,about nut size, although I am aware that the proportions may be cha d ascircumstances may require or the jiifi gment of the engineer in chargemay dictate. The composition 4 is spread in a plastic state over asuitably prepared roadbed and is preferably of uniform thickness. Beforelaying the composition 4 I place a strip of asbestos felt 3 against eachcurbstone, said strip 5 extending the entire length of the roadbed, andextending a short distance above the composition 4. At intervals acrossthe roadbed I place similar strips 6, 6', and upon opposite sides of therails 2, 2, I place similar strips 7, 7. The strips 6 and 7 extendlengthwise the roadbed and for the entire distance of the paved surface.The strips 6', 6', are preferably placed about twenty inches outside therails 2, 2, for a purpose hereinafter stated. At intervals in the pavedroadway I place similar strips extending transversely to the roadwaybetween the curbing 1, 1. These transverse strips are represented inFig. 1 at 8. The felt strips extendin entirely through the composition 4divi e it into separate rectangular blocks which, when the composition 4has become hardened form rectangular monolithic blocks. When thecomposition 4 has been smoothed to correspond with the required crown ofthe street and while it is yet in a plastic state, I provide a wearingsurface consisting of molded granolithic plates 9 which are preferablymade of equal parts of good hydraulic cement, sand, and broken stone,the latter being broken to about pea size or finer. The granolithicblocks 9, which I term wearing blocks, are prepared in suitable molds ofthe proper thickness to'fill the space between the base composition 4and the tops of the felt strips, and are preferably from 1;- to 2 inchesin thickness, and each block is provided on its upper side with a bevel10, Fig. 8.

When the blocks 9 are in a plastic state they are reinforced by means ofthe crossed wires 11, 12, and 13, said wires being united attheirjunction 14 either by electric or autog'enous welding. The ends of thereinforcing wires are bent at slightly acute angles to form prongs 11,12, and 13, which extend some distance beyondthe side of the-blocks 9 toform dowel pins, as shown in Fig. 3.

1 When the reinforcing wearing blocks 9 have been thoroughly dried, theyare applied to cover the upper surface of the basic composition 1, whilethe latter is in plastic state. Each block 9 is placed by hand sotheiredges will abut until the under surface between the felt strips'hasbeen covered. In applying the wearing blocks 9 sufficient pressure isapplied to force the projecting prongs ll, 12 and 13 into the plasticcomposition, and secure a continuous joint between it and the under sideof the wearing blocks.

The felt strips when inserted lengthwise of and transversely to thepaved roadbed constitute separating strips which permits any oneof therectangular blocks between these separating strips to be bodily removerand again replaced in position, thereby obviating the necessity oftotally destroying and relaying the pavement when street re-- pairs arerequired. For example, sections of the railway track can be replaced bytaking up the sections between the rails and the sections between thefelt strips 6 and 7 on each side of the track, thereby completelyuncov-' ering the ties 3, a sufficient distance beyond the ends of theties to allow them to be re placed and earth tamped under them.

In order to enable any one of the rectangular squares to be removedholes are drilled in suitable positions to properly balance the block tobe removed and expansion eyebolts 15 are inserted to which chains 16 areattached, terminating in a common ring 1'2. To the ring 17 I attachfalls 18 which are supported by any suitable elevating structure such asa derrick, or tripod 19.

In Fig. 7 I have shown a modification which consists in providing theupper su face of the composition 4' with any's'uitable water proofcomposition 20.

I have described one embodiment of my improved pavement, but I am awarethat changes may be made therein without deterial. The material of thestrips is not important so long as they perform the function ofseparating the plastic material used in the .pavement into blocks oflimited area which can be removed and replaced after the pavement hasbecome set. Neither do I wish to confine myself'to the use of a bearingsurface comprising blocks of the character described,

which are molded when ina plastic state and afterward dried. Insomecases it may be advisable to employ cast metal blocks of suitable sizeand thickness which may be given a corrugated or roughened outersurface.

In laying my improved pavement upona roadbe'd having an electricrailway, the space between the strips 7, 7, and beneath the crown of therails may be filled, preferably with the same material as the foundation4: to form a support or backing for the strips 7, 7, before the stripsare placed.

I claim, I

1. A pavement, consisting of a plastic foundation, separating stripsdividing said foundation into sections, a multiplicity of wearing blockssupported on, and covering, each of said sections, with the area of'saidwearing blocks corresponding with the area of said sections, means forinterlocking each of said wearing blocks with said foundation, with saidseparatingstri s extended upwardly between the wearing blocks on adjacent sections, whereby each section of said foundation with the wearingblocks supported thereon may be removed.

2. A pavement, consisting of aplastic foundation, separating stripsdividing said foundation into sections, a multiplicity of molded wearingblocks of concrete or similar material supported on said foundation andprovided with reinforcing wires projecting at acute angles to the undersurface of said blocks and inserted in said foundation, with saidseparating strips extended upwardly between the wearing blocksonadjacent sections.

3. A pavement, consisting of a foundation of concrete, separating stripsdividing said foundation into sections, a multiplicity of molded wearingblocks supported on, -and covering, said foundation with the area ofsaid wearing blocks corresponding with the area of each section of saidfoundation, each of said blocks having dowel pins inserted in saidfoundation, with said separating strips extended upwardly between theblocks on ad jacent sections, whereby each section of pavement may beraised out of its place by a lifting force applied to said wearingblocks.

4. A pavement, consisting of a foundation of concrete divided intosections by strips of asbestos, felt or similar material, whereby eachsection is rendered removable from its adjacent sections, a multiplicityof molded concrete blocks supported on, and covering, said foundation,with said separating strips extended upwardly between the molded blockson adjacent sections, and means for uniting said blocks and saidfoundation, 10 whereby said sections of the foundation and the blockssupported thereon may be raised by lifting means applied to said blocks.

WALTER E. HASSAM.

Witnesses NELLIE WHALEN, PENELOPE COMBERBACH.

